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hectocotylus
A hectocotylus (plural: ''hectocotyli'') is one of the arms of male cephalopods that is specialized to store and transfer spermatophores to the female. Structurally, hectocotyli are muscular hydrostats. Depending on the species, the male may use it merely as a conduit to the female, or he may wrench it off and present it to the female.
The name ''hectocotylus'' was devised by Georges Cuvier, who first found one embedded in the mantle of a female argonaut. Supposing it to be a parasitic worm, Cuvier gave it a generic name. The hectocotyl arm was first described in the biological works of Aristotle; although he knew of its use in mating, he was doubtful that a tentacle could deliver sperm.〔Armand Marie Leroi. The Lagoon: How Aristotle Invented Science. https://books.google.de/books?id=-DVBAwAAQBAJ&lpg=PT79&ots=G_61_CioQn&dq=aristotle%20hectocotylus&pg=PT80#v=onepage&q=aristotle%20hectocotylus&f=false〕〔Thompson, Darcy Wentworth. 1913. ''On Aristotle as a biologist, with a prooemion on Herbert Spencer''. Being the Herbert Spencer Lecture before the University of Oxford, on February 14, 1913. Oxford University Press. Page 19.〕〔Nixon M. & J.Z. Young J.Z. 2003. ''The brains and lives of Cephalopods''. Oxford University Press.〕
==Anatomy==
Generalized anatomy of squid and octopod hectocotyli:
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